Reactionary evolution

My creature starts out very snake like as its terrain is very open and flat. As this terrain opens up to reveal gaping fissures and towering mountains it must develop a way to jump to navigate these features. The tail splits in 2 and it rears back up on them. From here feet develop on the end and claws come through for gripping the rocky surface. The 2 tails form into the shape of legs much like that of a grasshopper and the head enlarges.